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Acta Mathematica Hungarica > 2016 > 150 > 2 > 512-523
Acta Mathematica Hungarica > 2016 > 148 > 2 > 300-311
Semigroup Forum > 2013 > 87 > 1 > 80-96
Acta Mathematica Hungarica > 2016 > 150 > 2 > 512-523
Acta Mathematica Hungarica > 2016 > 148 > 2 > 300-311
Semigroup Forum > 2013 > 87 > 1 > 80-96